The invention provides a cutting apparatus which has a vibration signal generation member for generating a vibration signal corresponding to the vibration; and a control member for judging the status of a cutting blade according to the vibration signal generated by the vibration signal generation member. The vibration signal generation member is formed by the following parts: ultrasonic vibrators configured at a first flange part and generating a voltage equivalent of the vibration signal corresponding to the vibration of the cutting blade; and a transfer member connected to ultrasonic vibrators and transferring the voltage to the control member. The control member has a storage member for storing a reference signal and a determination object signal, wherein the reference signal corresponds to the vibration signal caused by the vibration of the cutting blade accompanying the rotation of a spindle, and the determination object signal corresponds to the vibration signal caused by the vibration of the cutting blade accompanying the cutting of a processed object; and a comparison judgment member for judging the status of the cutting blade based on the signal obtained from removing the reference signal from the determination object signal.